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You should probably do the same - just explain to the psych that your DS has a habit of blurting and see if they will intervene somehow by maybe giving the question then immediately saying he should think about it before he answers.

DS will be tested by the school, as DD was. Though it is a different school and may be a different test (interestingly, this is not consistent across schools in our district), if past experience is any guide, we will never meet or speak to the tester.

I think your advice is good, though. He probably should have a little practice with learning to think before he blurts. I think this is associated with being underchallenged. I have been telling him to use his "chess brain," as he is NOT impulsive when playing chess.